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Warrants to Acquire Shares of Common Stock (Tables) | 6 Months Ended
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Jun. 30, 2021
Warrants and Rights Note Disclosure [Abstract] |
Schedule of Warrant Activity | The following is a summary of the activity of the Company's warrants to acquire shares of common stock for the six months ended June 30, 2021 (in thousands):
Warrant Issuance | Outstanding, December 31, 2020 |  | Granted |  | Exercised |  | Canceled/Expired |  | Outstanding, June 30, 2021 |  | Expiration
July 2020 PIPE Offering | 445 |  |  | — |  |  | (420) |  |  | — |  |  | 25 |  |  | August 2025
January 2020 Offering | 719 |  |  | — |  |  | (410) |  |  | — |  |  | 309 |  |  | July 2025
June 2019 Offering | 2 |  |  | — |  |  | (1) |  |  | — |  |  | 1 |  |  | June 2024
March 2019 Exercise Agreement | 63 |  |  | — |  |  | — |  |  | — |  |  | 63 |  |  | March 2024
July 2018 Offering | 141 |  |  | — |  |  | (1) |  |  | — |  |  | 140 |  |  | July 2023
Other | 22 |  |  | — |  |  | — |  |  | (1) |  |  | 21 |  |  | November 2021 - November 2023
| 1,392 |  |  | — |  |  | (832) |  |  | (1) |  |  | 559 |  |  |
Schedule of Fair Value of Warrants is Estimated Using Black-Scholes Option Pricing Model | The fair value of the warrants is estimated using a Black-Scholes pricing model with the following inputs:
As of June 30, 2021
Warrant Issuance | Outstanding (in thousands) |  | Strike price (per share) |  | Expected term (years) |  | Volatility % |  | Risk-free rate %
Other warrants (liability-classified) | 13 |  |  | $ | 7.50 |  |  | 2.26 |  | 151.45 | % |  | 0.30 | %
As of December 31, 2020
Warrant Issuance | Outstanding (in thousands) |  | Strike price (per share) |  | Expected term (years) |  | Volatility % |  | Risk-free rate %
Other warrants (liability-classified) | 13 |  |  | $ | 7.50 |  |  | 2.75 |  | 150.38 | % |  | 0.16 | %
Schedule of Changes in Fair Value of Warrant Liability | The changes in fair value of the warrant liability for the six months ended June 30, 2021 were as follows (in thousands):
Warrant Issuance | Warrant liability, December 31, 2020 |  |  |  |  |  |  |  | Change in fair value of warrants |  | Warrant liability, June 30, 2021
Other warrants (liability-classified) | $ | 55 |  |  |  |  |  |  |  |  | $ | 59 |  |  | $ | 114 |
| $ | 55 |  |  |  |  |  |  |  |  | $ | 59 |  |  | $ | 114 |

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